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Old 04-24-2019, 09:51 PM   #1
nickgordy1
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Os55 tuning


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Trying to refresh my memory on glow tuning for low speed and how do guys set there high speed.. On smith mini biplane with os55 and 12x6 prop
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Old 04-24-2019, 10:03 PM   #2
Cougar429
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Re: Os55 tuning

Start with the HS needle 1 3/4 turns out from lightly bottomed. The LS needle should be flush with the outer edge of the barrel, (not the throttle arm).

That should get you started.

Once fired up go full throttle and set slightly rich from peak. Hold the nose up after stabilizing to check it does not lean out. The HS needle controls mixture from 3/4 to full.

Slowly drop throttle and if required, tweak the LS for reliable idle. Once there open the throttle quickly and check response. If it stumbles then picks up it is too rich. If it quits it is too lean.

Note since no idea of the history on the engine you may find the engine needs to run slightly rich if not broken in yet. Also have a spare glow plug handy as that procedure is also rough on plugs and can compromise performance.
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Old 04-25-2019, 06:39 AM   #3
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Re: Os55 tuning

Also I'll mention that the OS "F" plug works the best in this engine.
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Old 04-25-2019, 08:29 AM   #4
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Re: Os55 tuning

I found only need to change from standard #8 under certain conditions:

Once temp drops to near or below freezing a hotter #3 plug can help keep it running at low throttle.

If inverted the OS "F" or "R", (rotary) plug is required as the fuel/air charge tends to wash and over cool the filament.

That brings up some other factors that will affect running and performance not covered in my first reply.

Along with engine history and mechanical condition, mounting orientation, tank height and fuel can play a role. Even line length and routing. If you opted for an aftermarket exhaust, as well. I ran Black Macs on mine and they tended to choke them a bit, but I have more often seen Pitts styles not provide enough vent pressure to the tank.

Pics of the installation would help here
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Old 05-30-2019, 07:58 AM   #5
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Re: Os55 tuning

Let us know how this turns out. Information may help others in the future.
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Old 06-08-2019, 08:59 PM   #6
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Re: Os55 tuning

https://www.horizonhobby.com/pdf/OSMG0557-Manual-EN.pdf

hope this helps and gets you running
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Old 06-09-2019, 09:48 PM   #7
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Re: Os55 tuning

Nick,
Head to the springford club. You can and hook up with Paul aurthur, Frank Klenk or Brian Mayhew(Sorry Brian I know I just messed up your last name) or others that can help you out. Many good guys in that club and all will help you succeed and not fail.

D
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Old 06-12-2019, 10:38 AM   #8
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Re: Os55 tuning

Quote:
Originally Posted by Cougar429 View Post
Start with the HS needle 1 3/4 turns out from lightly bottomed. The LS needle should be flush with the outer edge of the barrel, (not the throttle arm).

That should get you started.

Once fired up go full throttle and set slightly rich from peak. Hold the nose up after stabilizing to check it does not lean out. The HS needle controls mixture from 3/4 to full.

Slowly drop throttle and if required, tweak the LS for reliable idle. Once there open the throttle quickly and check response. If it stumbles then picks up it is too rich. If it quits it is too lean.

Note since no idea of the history on the engine you may find the engine needs to run slightly rich if not broken in yet. Also have a spare glow plug handy as that procedure is also rough on plugs and can compromise performance.
Extremely simplified and extremely easy to understand. Thanks a lot Cougar. Is it the same process for the OS AX 75?
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Old 06-12-2019, 11:28 AM   #9
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Re: Os55 tuning

Every OS 2-stroke I worked with pretty much runs close to the same settings.

Having said that, stayed away from much over 60 unless heli and their carbs are different.
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Old 06-12-2019, 11:58 AM   #10
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Re: Os55 tuning

Thanks Cougar. The procedure is outlined in the manual but your description is much easier to understand. Just a four step process for both H/L.
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